矿井的充水程度一般用()和()来表示。
参考答案:含水系数;矿井涌水量
In a crossing situation on open waters, a sailing vessel shall keep out of the way of all the following vessels except a vessel().
A.not under command
B.restricted in her ability to maneuver
C.engaged in towing
D.fishing
大陆法系传播的途径一是被动的殖民统治,二是主动学习和借鉴。